linux-kernel - Re: [PATCH 0/4] initial work on making VMA flags a bitmap

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Message-ID: <CAA1CXcBP1MYdBi55kdF83B5OD6uMoFmyKP95mWJx7gkwZDQxKg@mail.gmail.com>
Date: Thu, 30 Oct 2025 03:20:21 -0600
From: Nico Pache <npache@...hat.com>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>, Muchun Song <muchun.song@...ux.dev>, 
	Oscar Salvador <osalvador@...e.de>, David Hildenbrand <david@...hat.com>, 
	"Liam R . Howlett" <Liam.Howlett@...cle.com>, Vlastimil Babka <vbabka@...e.cz>, 
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	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org, 
	linux-mm@...ck.org, Alice Ryhl <aliceryhl@...gle.com>
Subject: Re: [PATCH 0/4] initial work on making VMA flags a bitmap

On Thu, Oct 30, 2025 at 2:34 AM Lorenzo Stoakes
<lorenzo.stoakes@...cle.com> wrote:
>
> +cc Alice - could you help look at this? It seems I have broken the rust
> bindings here :)

>From a first glance it looks trivial to fix, there are a bunch of
bindings of the VM_* flags.

for example

kernel/mm/virt.rs:    pub const MIXEDMAP: vm_flags_t =
bindings::VM_MIXEDMAP as vm_flags_t;

I believe this just needs to be converted to
'bindings::VM_MIXEDMAP_BIT' if I understand your series correctly
(havent fully looked at the details).

>
> Thanks!
>
> On Wed, Oct 29, 2025 at 09:07:07PM -0600, Nico Pache wrote:
> > Hey Lorenzo,
> >
> > I put your patchset into the Fedora Koji system to run some CI on it for you.
> >
> > It failed to build due to what looks like some Rust bindings.
> >
> > Heres the build: https://koji.fedoraproject.org/koji/taskinfo?taskID=138547842
> >
> > And x86 build logs:
> > https://kojipkgs.fedoraproject.org//work/tasks/7966/138547966/build.log
> >
> > The error is pretty large but here's a snippet if you want an idea
> >
> > error[E0425]: cannot find value `VM_READ` in crate `bindings`
> >    --> rust/kernel/mm/virt.rs:399:44
> >     |
> > 399 |     pub const READ: vm_flags_t = bindings::VM_READ as vm_flags_t;
> >     |                                            ^^^^^^^ not found in `bindings`
> > error[E0425]: cannot find value `VM_WRITE` in crate `bindings`
> >    --> rust/kernel/mm/virt.rs:402:45
> >     |
> > 402 |     pub const WRITE: vm_flags_t = bindings::VM_WRITE as vm_flags_t;
> >     |                                             ^^^^^^^^ not found
> > in `bindings`
> > error[E0425]: cannot find value `VM_EXEC` in crate `bindings`
> >      --> rust/kernel/mm/virt.rs:405:44
> >       |
> >   405 |     pub const EXEC: vm_flags_t = bindings::VM_EXEC as vm_flags_t;
> >       |                                            ^^^^^^^ help: a
> > constant with a similar name exists: `ET_EXEC`
> >       |
> >      ::: /builddir/build/BUILD/kernel-6.18.0-build/kernel-6.18-rc3-16-ge53642b87a4f/linux-6.18.0-0.rc3.e53642b87a4f.31.bitvma.fc44.x86_64/rust/bindings/bindings_generated.rs:13881:1
> >       |
> > 13881 | pub const ET_EXEC: u32 = 2;
> >       | ---------------------- similarly named constant `ET_EXEC` defined here
> > error[E0425]: cannot find value `VM_SHARED` in crate `bindings`
> >    --> rust/kernel/mm/virt.rs:408:46
> >     |
> > 408 |     pub const SHARED: vm_flags_t = bindings::VM_SHARED as vm_flags_t;
> >     |                                              ^^^^^^^^^ not found
> > in `bindings`
> >
> > In the next version Ill do the same and continue with the CI testing for you!
>
> Thanks much appreciated :)
>
> It seems I broke the rust bindings (clearly), have pinged Alice to have a
> look!
>
> May try and repro my side to see if there's something trivial that I could
> take a look at.
>
> I ran this through mm self tests, allmodconfig + a bunch of other checks
> but ofc enabling rust was not one, I should probably update my scripts [0]
> to do that too :)

Ah cool, thanks for sharing your scripts, Ill take a look into those!

Cheers,
-- Nico
>
> Cheers, Lorenzo
>
> [0]:https://github.com/lorenzo-stoakes/review-scripts
>